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2002 YZ426 motor into my 2000 WR400

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I have an opportunity to acquire a 2002 YZ426 motor and I would like to swap it directly into my 2000 wr400... that is if this is possible.

My research has lead me to belive that this is in fact possible, but only for 2001 426 motors, since the swingarm bolt was larger in diameter for 2002.

Could I buy the larger 2002 swingarm bolt and use it in my WR400?

My other question is that in order for me to retain my headlight, can I swap out my old stator into the new 426 motor, and are the CDI boxes the same between the bikes?

Thanks, all input is appreciated.

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